scholarly journals Building solids inside nano-space: from confined amorphous through confined solvate to confined ‘metastable’ polymorph

2015 ◽  
Vol 17 (38) ◽  
pp. 24761-24773 ◽  
Author(s):  
K. P. Nartowski ◽  
J. Tedder ◽  
D. E. Braun ◽  
L. Fábián ◽  
Y. Z. Khimyak
Keyword(s):  
Solid State ◽  
Structural Analysis ◽  
Mesoporous Silicas ◽  
Detailed Structural Analysis ◽  
Pharmaceutical Molecules

The detailed structural analysis and the control of solid state transformations of encapsulated pharmaceutical molecules inside the pores of mesoporous silicas are demonstrated.

A bis-Au(III) [28]hexaphyrin triphenylphosphine adduct

2016 ◽  
Vol 20 (08n11) ◽  
pp. 997-1001 ◽  
Author(s):  
Koji Naoda ◽  
Atsuhiro Osuka
Keyword(s):  
Solid State ◽  
Structural Analysis ◽  
Trifluoroacetic Acid ◽  
X Ray Diffraction ◽  
Nmr Spectrum ◽  
X Ray ◽  
H Nmr ◽  
Detailed Structural Analysis ◽  
Nir Absorption ◽  
Plausible Mechanism

Triphenylphosphine was added regioselectively at the C(3) position of bis-Au(III) complex of [26]hexaphyrin 5 in the presence of trifluoroacetic acid to produce [28]hexaphyrin triphenylphosphine adduct 6 in 62% yield, which has been fully characterized by NMR, UV-vis/NIR absorption, and MS spectroscopies, and X-ray diffraction analysis. The rigid planar structure forces 6 to take Hückel antiaromaticity, which has been supported by its 1H NMR spectrum. Curiously, the detailed structural analysis elucidated that the triphenylphosphine moiety exists as a phosphorane form in the solid state. A plausible mechanism via a double protonated 5 is proposed, which can explain the observed regioselectivity.

scholarly journals Taking Advantage of Ortho- and Peri-Substitution to Design Original 9-Membered P,O,Si-Heterocycles

2021 ◽  
Author(s):  
Thomas Delouche ◽  
Elsa Caytan ◽  
Cassandre Quinton ◽  
Thierry Roisnel ◽  
Marie Cordier ◽  
...  
Keyword(s):  
Solid State ◽  
Structural Analysis ◽  
Synthetic Method ◽  
Phosphine Oxides ◽  
X Ray ◽  
Detailed Structural Analysis

A family of 9 cyclic phosphine-disiloxane featuring peri-substituted naphthyl(Nap)/acenaphthyl(Ace) scaffolds have been prepared and fully characterized including X-ray structure, which allows a detailed structural analysis. This straightforward synthesis takes advantage of both ortho- and peri-substitution of Nap/Ace-substituted phosphine oxides. The synthetic method allows diversifying the polyaromatic platform (Nap and Ace) as well as the Si substituents (Me and Ph). Despite a strong steric congestion, the P-atom remains reactive toward oxidation or coordination. In particular, Au(I) complex could be prepared. All the compounds display absorption/luminescence in the UV-Vis range. Surprisingly, the P-trivalent derivatives display unexpected luminescence in the green in solid-state.

scholarly journals Taking Advantage of Ortho- and Peri-Substitution to Design Original 9-Membered P,O,Si-Heterocycles

2021 ◽  
Author(s):  
Thomas Delouche ◽  
Elsa Caytan ◽  
Cassandre Quinton ◽  
Thierry Roisnel ◽  
Marie Cordier ◽  
...  
Keyword(s):  
Solid State ◽  
Structural Analysis ◽  
Synthetic Method ◽  
Phosphine Oxides ◽  
X Ray ◽  
Detailed Structural Analysis

A family of 9 cyclic phosphine-disiloxane featuring peri-substituted naphthyl(Nap)/acenaphthyl(Ace) scaffolds have been prepared and fully characterized including X-ray structure, which allows a detailed structural analysis. This straightforward synthesis takes advantage of both ortho- and peri-substitution of Nap/Ace-substituted phosphine oxides. The synthetic method allows diversifying the polyaromatic platform (Nap and Ace) as well as the Si substituents (Me and Ph). Despite a strong steric congestion, the P-atom remains reactive toward oxidation or coordination. In particular, Au(I) complex could be prepared. All the compounds display absorption/luminescence in the UV-Vis range. Surprisingly, the P-trivalent derivatives display unexpected luminescence in the green in solid-state.

scholarly journals The synthesis: Structure relationship in the ZnO-Cr2O3 system

2004 ◽  
Vol 36 (3) ◽  
pp. 189-196 ◽  
Author(s):  
Lidija Mancic ◽  
Zorica Marinkovic ◽  
P. Vulic ◽  
Olivera Milosevic
Keyword(s):  
Solid State ◽  
Structural Analysis ◽  
Spinel Phase ◽  
Xrd Analysis ◽  
Structural Defects ◽  
Ion Distribution ◽  
Crystal Lattices ◽  
Detailed Structural Analysis ◽  
Crystallite Sizes ◽  
Structure Relationship

In this work the development of the spinel phase in the ZnO-Cr2O3 system was discussed from the viewpoint of the synthesis-structure relationship. The nanostructure evolution in particles obtained either via solution-based (spray pyrolysis) or solid-state (mechanical activation) synthesis procedures were investigated by XRD analysis. A detailed structural analysis of the spinel phase lattice parameters, average primary crystallite sizes and micro strains were performed in accordance with a procedure based on the Koalariet-Xfit program. Due to the importance of spinel-phase cat ion distribution for chemical and physical properties, a study of the site occupation factors, i.e. changes in the stoichiometric, of ZnCr2O4 spinals was undertaken. The calculation based on atomistic methods for the description of both perfect and defect spinel ZnCr2O4 crystal lattices has been applied and the presence of individual structural defects was determined.

Structural Analysis of Slag and Cement Materials by Solid-state NMR

2018 ◽  
Vol 56 (5) ◽  
pp. 454-459
Author(s):  
T. Takahashi ◽  
T. Ohkubo ◽  
K. Kanehashi
Keyword(s):  
Solid State ◽  
Structural Analysis ◽  
Solid State Nmr

scholarly journals Chemical Modification of Combusted Coal Gangue for U(VI) Adsorption: Towards a Waste Control by Waste Strategy

2021 ◽  
Vol 13 (15) ◽  
pp. 8421
Author(s):  
Yuan Gao ◽  
Jiandong Huang ◽  
Meng Li ◽  
Zhongran Dai ◽  
Rongli Jiang ◽  
...  
Keyword(s):  
Structural Analysis ◽  
High Efficiency ◽  
Low Cost ◽  
Chemical Activation ◽  
Cost Effective ◽  
Coal Gangue ◽  
Order Kinetic ◽  
Practical Applications ◽  
Detailed Structural Analysis ◽  
Alkaline Conditions

Uranium mining waste causes serious radiation-related health and environmental problems. This has encouraged efforts toward U(VI) removal with low cost and high efficiency. Typical uranium adsorbents, such as polymers, geopolymers, zeolites, and MOFs, and their associated high costs limit their practical applications. In this regard, this work found that the natural combusted coal gangue (CCG) could be a potential precursor of cheap sorbents to eliminate U(VI). The removal efficiency was modulated by chemical activation under acid and alkaline conditions, obtaining HCG (CCG activated with HCl) and KCG (CCG activated with KOH), respectively. The detailed structural analysis uncovered that those natural mineral substances, including quartz and kaolinite, were the main components in CCG and HCG. One of the key findings was that kalsilite formed in KCG under a mild synthetic condition can conspicuous enhance the affinity towards U(VI). The best equilibrium adsorption capacity with KCG was observed to be 140 mg/g under pH 6 within 120 min, following a pseudo-second-order kinetic model. To understand the improved adsorption performance, an adsorption mechanism was proposed by evaluating the pH of uranyl solutions, adsorbent dosage, as well as contact time. Combining with the structural analysis, this revealed that the uranyl adsorption process was mainly governed by chemisorption. This study gave rise to a utilization approach for CCG to obtain cost-effective adsorbents and paved a novel way towards eliminating uranium by a waste control by waste strategy.

Molecular ordering of mixed surfactants in mesoporous silicas: A solid-state NMR study

2011 ◽  
Vol 39 (3-4) ◽  
pp. 65-71 ◽  
Author(s):  
Takeshi Kobayashi ◽  
Kanmi Mao ◽  
Shy-Guey Wang ◽  
Victor S.-Y. Lin ◽  
Marek Pruski
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Mesoporous Silicas ◽  
Mixed Surfactants ◽  
Nmr Study ◽  
Molecular Ordering

Tetrasulfinylcalix[4]arenes: Synthesis and solid state structural analysis

1999 ◽  
Vol 40 (6) ◽  
pp. 1129-1132 ◽  
Author(s):  
Gilles Mislin ◽  
Ernest Graf ◽  
Mir Wais Hosseini ◽  
André De Cian ◽  
Jean Fischer
Keyword(s):  
Solid State ◽  
Structural Analysis
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